I know things must seem hopeless, but they don't have to be. Coming here is a step in the direction of recovery.
What is the pain issue that started your drug use?
As for what to do, you probably have to look locally for some form of detox/rehab. You have a computer...Try the Salvation Army. At least get started with seeking out solutions. Nar-anon might have a list of substance abuse places. We have a forum for substance abuse:
Substance Abuse - SoberRecovery : Alcoholism Drug Addiction Help and Information
I know it's not a lot of help. I just wanted to welcome you. Don't let your current despair make you think things can't get better.